Spinner graphical bug API 21

问题:

I have one spinner in a fragment that have a very annoying graphical glitch. This occurs only on my Nexus 5 with API 21.

I have try to set spinner.setLayerType(View.LAYER_TYPE_SOFTWARE, null) but the glitch is still present. Any ideas?

回答1:

I managed to work around this bug in two different ways:

1. Set a style to your spinner:

   <Spinner
       android:background="@drawable/background"
       android:id="@+id/spinner"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       style="@android:style/Widget.Holo.Light.Spinner"/>
   

maybe the background color in the predefined styles is enough for you. If not try

2. Create a shape drawable with a corner radius:

   <?xml version="1.0" encoding="utf-8"?>
   <shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
       <corners android:radius="2dp" />
       <solid android:color="#00ff00" />
   </shape>
   

and set it as a popupBackground to your spinner

    <Spinner
        android:background="@drawable/spinner_background"
        android:id="@+id/date_spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:clickable="false"
        android:popupBackground="@drawable/spinner_popup_background"/>

hope this is helpful!